please, a little help with a 7.1 channel aac...

hi, i am looking for people with a (FL FR FC LFE BL BR SL SR) willing to test a small sample of 7.1 channel aac in .mkv and .mp4... is the zip... please post your software/hardware setup and if the channels are (or not) in the correct positions... ex: hardware: pc + optical out + 7.1 aac receiver software: some player channel position : OK for both .mkv and .mp4 hardware: xtreamer software: linux based channel position : ........ thanks a lot... _

hardware: pc, 8 analog out, 6 (FL,FR,FC,LF,BL,BR) to a 5.1 receiver + 2 (SL,SR) to a 2.0 speakers software: Foobar2000, vlc channel position : OK for both .mkv and .mp4 Sorry, is my hardware to test 7.1. I have a Xtreamer but not a 7.1 receiver. With DirectShow (Haali splitter + ffdshow decoder) wrong decode. NeroAacDec decode the .mp4 ok to wav with correct channel order.

FWIW, the channels present in your file don't correspond to what QuickTime is expecting for 8-channel AAC. Your file looks like what QuickTime expects for AAC 7.0, with an additional LFE channel at the end. But for 8-channel, QuickTime expects either of the following: "AAC 7.0" + back center "AAC 7.1" (default?) Here's what I get when I open your sample with QT 7 Player Pro: So it seems that QuickTime won't play your file correctly and/or as expected. Hopefully this is relevant to your testing. Edit I don't have a 7.1 setup, but if I play each channel individually (disabling all other channels), here's what the channel order looks like in your file ("AAC 7.0" + LFE): Where Left Surround means Side Left, Rear Surround Left means Back Left, etc. The only way to get QuickTime to use this channel order is to edit it manually, however; by default it'll pick the channels & order shown in the first capture.

If it helps... Here's a link to a 7.1Ch AAC-LC file I created some time ago from an 7.1Ch Dolby TrueHD source. God knows why it says what it says in the "assignment box"... but the file is correctly mapped when played in hardware! Cheers

@tebasuna51 & @Rodeo & @SeeMoreDigital thanks a lot...

FWIW, your file indicates a channelConfiguration of 7 in the AudioSpecificConfig(), which as per the AAC specification means the following channel arrangement: Code: